PSYC1003 Lecture 6: psyc7

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Dr.Harald Taukulis

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Secondary pathway: superior colliculus→ thalamus→ primary visual cortex Feature detectors: microelectrode recording of axons in animals lead to the discovery of feature detectors- neurons that respond selectively to lines, edges, etc.Ventral visual stream: the “what” pathway- colour, shape, etc. Dorsal visual system: the “where” pathway- depth, motion, etc. Visual agnosia: inability to recognize objects Prosopagnosia: inability to recognize faces Subtractive colour mixing: removing certain colour from the mixture; perceiving less light Additive colour mixing: putting more colours in the mixture; perceiving more light Colour vision theories:  Trichromatic colour theory: receptors for red, green, and blue are in cones; colour mixing is done in our own eyes  Opponent process theory: three pairs of antagonist colours: red/green, blue/yellow, black/white  Current perspective: both theories necessary Reversible figure: a drawing compatible with two interpretations Perceptual set: readiness to perceive a stimulus in a certain way Inattentional blindness: failure to see fully visible objects Top-down processing- formulate perceptual hypothesis about the nature of the stimulus as a whole, select and examine features to check hypothesis, recognize stimulus Bottom up processing: Detect specific features of stimulus, combine specific features into more complex forms, recognize stimulus Gestalt principles:  “The whole is greater than the sum of its parts”  Phi phenomenon: the illusion of movement created by presenting visual stimuli in rapid succession (flip book)  Figure and ground: figure is the thing being looked at; ground is it
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